I next tried to image a whole APFS container, and that started to look promising, but then failed. To create a valid APFS disk image, device needs to be an APFS container or contain an APFS container partition.” If you want to create an image of a volume (or do almost anything else with disk images), then you’re much better off using C-Command’s excellent DropDMG. There are hints about this in the hdiutil man page, where it warns “with APFS, imaging from a device that is an individual APFS volume is invalid. My first discovery is that Disk Utility can’t create a disk image from an APFS volume at all, despite the promises in its Help book. That sounds strange, as if it hasn’t been updated for APFS, as Apple’s new file system’s volumes don’t have any free space of their own. When creating one from a disk or volume, the image contains the whole of that item, including free space, whereas creating one from a folder only occupies the space needed to contain its data. What happened wasn’t what I expected, nor what it documented in its Help book.Īccording to the Help book, Disk Utility can create a disk image from a disk, volume, folder or connected device. For various reasons, one of them sheer curiosity, I wanted to image one of my disks, and turned to Disk Utility (version 19.0 (1704), as supplied in Catalina 10.15.6).
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